"""
百分制成绩转换为等级制成绩

Version: 0.1
Author: yuwl
Date: 2023-10-15
"""

score = float(input('请输入成绩： '))
if score >= 90:
	grade = 'A'
elif score >= 80:
	grade = 'B'
elif score >= 70:
	grade = 'C'
elif score >= 60:
	grade = 'D'
else:
	grade = 'E'
print('对应的等级是：', grade)